I think that he is a part of the Crimson Order. He has a title (like Seerus). He acts like he could be a part of it.
Possible Reasons for Being at The Surface
Maybe the artifact from introductory mission could be very important to the Gremlins. It could possibly be something like a Sector Generator. By Sector Generator I mean a power source that powers a specific section of the clockwork. It could be put into some slot or something and channel the core's energy. So if the artifact goes missing, a sector of the clockwork would have no energy wired to it. Maybe the artifact went missing and The Crimson Order(or Tinkinzar) put Razwog on the mission to find it. When he meets you he might think you stole and doesn't realize you are trying to turn the power back on as well.
Thats my thoughts on this
I think the reason he's on the surface is because his parents yelled at him for his "punk" lifestyle so he ran away from home shouting "[forget] the system!" at his Gremlin mum and pop. Then he ran to the surface to grab the Aritfact, so that he can use it to fuel his anarchist needs.